x86-bare-metal-examples/idt_zero_divide.S

/* https://github.com/cirosantilli/x86-bare-metal-examples#idt-divide-by-zero */

#include "common.h"
BEGIN
    STAGE2
    CLEAR
    PROTECTED_MODE
    IDT_SETUP_ENTRY $0, $handler
    lidt idt_descriptor
    mov $0, %edx
    mov $1, %eax
    mov $0, %ecx
    /* The iret jumps back here. */
    div %ecx
    jmp .
IDT_START
IDT_ENTRY
IDT_END
handler:
    VGA_PRINT_STRING $message
    /* If we don't do this, we get an infinite loop. */
    mov $1, %ecx
    iret
message:
    .asciz "division by zero handled"
link all examples to header 2018-12-04 09:46:27 +00:00			`/* https://github.com/cirosantilli/x86-bare-metal-examples#idt-divide-by-zero */`

idt 2015-10-21 21:41:07 +02:00			`#include "common.h"`
			`BEGIN`
			`STAGE2`
			`CLEAR`
			`PROTECTED_MODE`
DRY up IDT 2015-10-23 17:57:12 +02:00			`IDT_SETUP_ENTRY $0, $handler`
idt 2015-10-21 21:41:07 +02:00			`lidt idt_descriptor`
Divide by zero 32-bit works 2015-10-21 22:48:56 +02:00			`mov $0, %edx`
			`mov $1, %eax`
			`mov $0, %ecx`
Move all documentation to README.adoc This includes both separate .md files, and documentation that was on the head of the .S source files. Retest everything as this was done, and fix a few easy things. 2018-05-06 14:33:33 +01:00			`/* The iret jumps back here. */`
Divide by zero 32-bit works 2015-10-21 22:48:56 +02:00			`div %ecx`
idt 2015-10-21 21:41:07 +02:00			`jmp .`
DRY up IDT 2015-10-23 17:57:12 +02:00			`IDT_START`
			`IDT_ENTRY`
			`IDT_END`
idt 2015-10-21 21:41:07 +02:00			`handler:`
			`VGA_PRINT_STRING $message`
Move all documentation to README.adoc This includes both separate .md files, and documentation that was on the head of the .S source files. Retest everything as this was done, and fix a few easy things. 2018-05-06 14:33:33 +01:00			`/* If we don't do this, we get an infinite loop. */`
Divide by zero 32-bit works 2015-10-21 22:48:56 +02:00			`mov $1, %ecx`
idt 2015-10-21 21:41:07 +02:00			`iret`
			`message:`
Page fault handler works! 2015-10-28 18:36:31 +01:00			`.asciz "division by zero handled"`